Sole Structure of Footwear

Abstract

The present invention provides a sole structure of footwear which makes it possible for a user to walk in a special position such that a toe part is in a raised state, thus providing an exercise effect, and is constructed such that the inclination of the footwear can be smoothly changed forwards and backwards based on a metatarsal bone part, so that the user can naturally conduct exercise. To achieve the above purposes, the present invention comprises a main sole, which has an outline that approximately corresponds to an outline of a foot sole, a front cushion sole, which is coupled to a portion of the main sole which is ahead of the metatarsal bone part, and a rear cushion sole, which is coupled to a portion of the main sole which is behind of the metatarsal bone part.

1 . A sole structure of footwear, comprising:
 a main sole having an outline corresponding to an outline of a foot sole of a user;   a front cushion sole coupled to a portion of the main sole that is ahead of a metatarsal bone part of the main sole; and   a rear cushion sole coupled to a portion of the main sole which is behind the metatarsal bone part, wherein   the front and rear cushion soles are compressed by weight of the user ahead of and behind the metatarsal bone part, so that inclination of the entire sole is changed based on the metatarsal bone part.   
     
     
         2 . The sole structure of the footwear according to  claim 1 , wherein the rear cushion sole is coupled to a lower surface of the portion of the main sole which is behind the metatarsal bone part. 
     
     
         3 . The sole structure of the footwear according to  claim 2 , wherein the front cushion sole is increased in height from a rear end thereof to a front end thereof, and the rear cushion sole is increased in thickness from a front end thereof to a rear end thereof. 
     
     
         4 . The sole structure of the footwear according to  claim 3 , wherein an opening is formed through a heel portion of the main sole, which corresponds to a heel of the user, and a portion of the rear cushion sole, which corresponds to the opening of the main sole, protrudes upwards to directly contact the heel of the user. 
     
     
         5 . The sole structure of the footwear according to  claim 3 , wherein a heel portion of the main sole and a portion of the rear cushion sole that corresponds to the heel portion of the main sole form a sealed space therebetween, the sole structure further comprising:
 a tube disposed at a first end thereof in the sealed space and exposed at a second end thereof outside the sealed space.   
     
     
         6 . The sole structure of the footwear according to  claim 5 , wherein a support boss is provided at a center position in the sealed space to support the weight of the user, thus preventing the heel portion from being rapidly depressed. 
     
     
         7 . The sole structure of the footwear according to  claim 6 , wherein the second end of the tube is disposed at a position corresponding to arch parts of toes. 
     
     
         8 . The sole structure of the footwear according to  claim 1 , wherein the rear cushion sole is coupled to an upper surface of the portion of the main sole which is behind the metatarsal bone part. 
     
     
         9 . The sole structure of the footwear according to  claim 3 , wherein an air tunnel is laterally formed in each of portions of the main sole that contact the front and rear cushion soles. 
     
     
         10 . The sole structure of the footwear according to  claim 9 , wherein an air circulation hole extends from each of the air tunnels to the upper surface of the main sole. 
     
     
         11 . The sole structure of the footwear according to  claim 10 , wherein the air tunnels are formed in portions of the main sole that correspond to the arch parts of the toes and an arch part of the foot sole. 
     
     
         12 . The sole structure of the footwear according to  claim 11 , further comprising:
 an insole having air circulation openings at positions corresponding to the air circulation holes.